A-LevelComputer ScienceCommunication and internet technologies9618/32 · May/June 2022 · Q38 Marks
The TCP/IP protocol suite has four layers. The application layer provides user services.
- (a)Identify two protocols used by this layer. Describe the use of each protocol. Protocol 1 Description Protocol 2 Description[4]
- (b)Identify two other layers of the TCP/IP protocol suite. Describe the function of each layer. Layer 1 Description Layer 2 Description[4]
Mark scheme
Marking points from the official mark scheme (May/June 2022). The mark or mark type is shown in brackets.
- [4] Protocol one mark, description one mark, max four Any two from • HTTP(S) (1) for sending and receiving web pages / hypertext documents (1) • FTP (1) for sending and receiving files over a network / between devices (1) • SMTP (1) for sending/uploading emails /push protocol (1) • POP(3) (1) for receiving/downloading emails /pull protocol (1) • IMAP (1) for receiving/downloading emails /pull protocol (1)
- [4] Layer one mark, matching function one mark, max four Any two from • Transport (1) handles packets (1) • Internet (1) handles transmission of data using IP addresses // provides (optimal) route (1) • Network Access (Interface) // (Data) Link // Physical (1) Handles how data is physically sent (1)
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